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OpenAI: GPT-5.6 Terra vs xAI: Grok 4.3

Summary

GPT-5.6 Terra (low) vs Grok 4.3 (medium) benchmark comparison: The average score is effectively tied at 7.7 vs 7.7. GPT-5.6 Terra (low) has the lower benchmark cost at $0.343 vs $0.614. GPT-5.6 Terra (low) is faster at 4.88s vs 47.51s, with pass rates of 74.6% vs 71.4%.

Recommended model: GPT-5.6 Terra (low) - It has the best score here (7.7), while costing about 1.8x less than Grok 4.3 (medium).

Last updated at: 2026-07-09

Metric GPT-5.6 Terra GPT-5.6 Terra low Release: 2026-07-09 Grok 4.3 Grok 4.3 medium Release: 2026-05-01
Score 7.7 7.7
Rank #47 #46
Reliability 10.0 10.0
Consistency 8.1 8.5
Tests Correct
Attempt pass rate 74.6% 71.4%
Flaky tests 5 4
Total Runs 63 63
Cost per result 2.637 4.724
Total Cost $0.343 $0.614
Input Price $2.500 / 1M $1.250 / 1M
Output Price $15.000 / 1M $2.500 / 1M
Total Input Tokens 34,226 44,472
Output Tokens 1,943 1,981
Reasoning Tokens 15,201 221,382
Response Time (avg) 4.88s 47.51s
Response Time (max) 19.85s 216.69s
Response Time (total) 102.53s 997.68s

Generation showcase

Hamster playing table tennis

Prompt: Create a detailed SVG illustration of a hamster playing table tennis.

#47 GPT-5.6 Terra

low
Cost
$0.034
Time
16.8s
Tokens
2,348 tok

#46 xAI: Grok 4.3

medium
Cost
$0.009
Time
19.0s
Tokens
3,661 tok

Top Models by Score

Score vs Total Cost

Response Time (avg)

Score vs Response Time (avg)

Total Output Tokens

Score vs Total Output Tokens

Category Breakdown

Anti-AI Tricks Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 8.3 10.0 75.0% 0 2.36s 606 171 602
Grok 4.3 10.0 10.0 100.0% 0 8.83s 2,010 88 8,207
Coding Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 6.6 4.6 77.8% 2 9.56s 7,302 429 6,821
Grok 4.3 5.9 7.7 44.4% 1 41.23s 8,340 1,028 31,226
Combined Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 10.0 10.0 100.0% 0 5.07s 11,019 312 349
Grok 4.3 10.0 10.0 100.0% 0 63.99s 12,909 234 15,301
Data parsing and extraction Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 10.0 10.0 100.0% 0 919ms 7,140 222 0
Grok 4.3 10.0 10.0 100.0% 0 18.97s 7,761 180 9,546
Domain specific Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 5.3 7.2 44.4% 1 8.34s 723 72 4,086
Grok 4.3 5.3 7.2 44.4% 1 181.74s 1,764 14 111,300
General Intelligence Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 4.8 3.2 33.3% 1 3.52s 477 105 249
Grok 4.3 5.4 2.5 66.7% 1 24.70s 825 70 5,020
Instructions following Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 10.0 10.0 100.0% 0 1.48s 660 87 134
Grok 4.3 9.8 10.0 100.0% 0 18.58s 1,362 57 8,713
Puzzle Solving Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 10.0 10.0 100.0% 0 4.46s 642 259 1,506
Grok 4.3 5.9 7.2 55.6% 1 22.52s 1,689 128 14,468
Tool Calling Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 4.7 1.6 66.7% 1 6.69s 5,462 257 226
Grok 4.3 10.0 10.0 100.0% 0 17.66s 7,263 168 4,615
Trivia Score Consistency Attempt pass rate Flaky tests Tests Correct Response Time (avg) Input Tokens Output Tokens Reasoning Tokens
GPT-5.6 Terra 3.0 10.0 0.0% 0 5.95s 195 29 1,228
Grok 4.3 3.0 10.0 0.0% 0 44.47s 549 14 12,986

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